W = weight in kg · H = height in cm · A = age in years. This is the Mifflin-St Jeor equation, considered the most accurate BMR formula for most people.
Frequently Asked Questions
What is BMR?+
BMR (Basal Metabolic Rate) is the number of calories your body needs to perform basic life-sustaining functions at complete rest — breathing, circulation, cell production.
BMR vs TDEE — which should I use?+
Use BMR as a baseline reference. Use TDEE (BMR × activity multiplier) for actual daily calorie needs when planning diet and exercise.
Does BMR change with age?+
Yes. BMR generally decreases with age, which is why older people often find it harder to maintain weight with the same diet.